[SciPy-dev] Matrix Structure Plots in scipy ?

Nils Wagner nwagner at mecha.uni-stuttgart.de
Wed Oct 6 07:51:15 CDT 2004


Pearu Peterson wrote:

>
>
> On Wed, 6 Oct 2004, Nils Wagner wrote:
>
>> Is it also possible, that mmread returns sparse matrices when reading
>> sparse matrices from *.mtx ?
>
>
> Now yes, mmread will return coo_matrix instance when reading coordinate
> .mtx files.
>
>> Is it generally possible to switch between sparse and dense format of 
>> matrices in scipy ?
>
>
> Yes.
>
>> From sparse to dense: <spmatrix instance>.todense()
>> From dense to sparse: <spmatrix class>(<array>)
>
>
> For more info, see scipy.sparse.Sparse.
>
>> Now, scipy has some iterative solvers for linear systems. Can I use both
>> dense and sparse matrices with respect to cg,... ?
>>
>> How about sparse eigensolvers in scipy e.g. ARPACK ?
>
>
> Cannot answer these questions right now...
>
There seems to be an interface to ARPACK, but  I don't know anything
about its possibilities...

http://jrfonseca.dyndns.org/work/phd/

Any comments ?

Nils

> Pearu
>
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